From 9d002df492b14c690425d9785530371b6c1ccbca Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Wed, 6 Oct 2010 19:51:11 -0400 Subject: cifs: add routines to build sessions and tcons on the fly This patch is rather large, but it's a bit difficult to do piecemeal... For non-multiuser mounts, everything will basically work as it does today. A call to cifs_sb_tlink will return the "master" tcon link. Turn the tcon pointer in the cifs_sb into a radix tree that uses the fsuid of the process as a key. The value is a new "tcon_link" struct that contains info about a tcon that's under construction. When a new process needs a tcon, it'll call cifs_sb_tcon. That will then look up the tcon_link in the radix tree. If it exists and is valid, it's returned. If it doesn't exist, then we stuff a new tcon_link into the tree and mark it as pending and then go and try to build the session/tcon. If that works, the tcon pointer in the tcon_link is updated and the pending flag is cleared. If the construction fails, then we set the tcon pointer to an ERR_PTR and clear the pending flag. If the radix tree is searched and the tcon_link is marked pending then we go to sleep and wait for the pending flag to be cleared. Signed-off-by: Jeff Layton Signed-off-by: Steve French --- fs/cifs/cifs_fs_sb.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'fs/cifs/cifs_fs_sb.h') diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h index e04e6923d354..5ce57bdf1865 100644 --- a/fs/cifs/cifs_fs_sb.h +++ b/fs/cifs/cifs_fs_sb.h @@ -15,6 +15,8 @@ * the GNU Lesser General Public License for more details. * */ +#include + #ifndef _CIFS_FS_SB_H #define _CIFS_FS_SB_H @@ -40,8 +42,9 @@ #define CIFS_MOUNT_MULTIUSER 0x20000 /* multiuser mount */ struct cifs_sb_info { - struct cifsTconInfo *ptcon; /* primary mount */ - struct list_head nested_tcon_q; + struct radix_tree_root tlink_tree; +#define CIFS_TLINK_MASTER_TAG 0 /* is "master" (mount) tcon */ + spinlock_t tlink_tree_lock; struct nls_table *local_nls; unsigned int rsize; unsigned int wsize; -- cgit v1.2.3